Thermal stability of shielding effectiveness of electromagnetic interference of composites

Abstract

A series of composites were prepared using polyethylene and various chatter-machined metal fibres (aluminium, copper, steel and brass) and carbon fibre, and the effects of the concentration of the fillers and the thermal treatment of the composites at 80° C in air on the shielding effectiveness (SE) of eleotronnagnotic interference were examined. The order of the generation of SE was, brass > steel > copper ≈ aluminium > carbon. Thermal degradation of SE was scarcely observed in the carbon fibre system and very slightly in the brass and steel systems, while remarkable degradation was observed in the copper and aluminium systems. This degradation was assumed to be due to the formation of an oxidized surface to increase the contact resistance between fillers. Stabilization of the thermal degradation of SE of the aluminium composite was possible to some extent when the aluminium surface was pretreated with certain reagents.